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chromium/third_party/blink/web_tests/fast/parser/entity-comment-in-iframe.html 

<html>
<head>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
</script>
</head>
<body>
<iframe>
&lt;!-- </iframe> --&gt;
This should not be part of the iframe (and therefore visible).
</iframe>
</body>
</html>